http://3cbzkrvakrpetjjppdwzbzqrlkmzatjs7jbyazap5gwutj32gcltjpqd.onion
I will soon post an updated version of the patchset to
the notmuch mailing list (I wanted to refer to this post in my
email). In this blog post I'll outline my experiments with using that
tool, along with git-annex to store (and sync) a moderate sized
email store along with its notmuch metadata.